Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1990-12-19
1992-10-06
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
264314, 2643287, 425417, B29C 4318, B29C 4514
Patent
active
051529491
ABSTRACT:
A method for resin transfer molding composite articles of complex configuration that have high fiber-to-resin ratios. The molding apparatus includes a compliant mold subassembly having one or more conformable cauls and a complementary, non-permeable membrane that function, in combination, as a semi-rigid molding tool. The compliant mold subassembly is relatively insensitive to bulk variations of layed-up fiber reinforcement material, facilitating fiber reinforcement material lay up and closure of the molding apparatus. The compliant mold subassembly provides uniform pressures during various molding stages, i.e., resin injection, expulsion of excess resin, curing, to enhance the homogeneity and dimensional stability of the finished composite article. The semi-rigid aspect of the compliant mold subassembly facilitates demolding of the finished composite article. The process utilizes stage pressurization transmitted through the compliant mold subassembly to enhance resin flow for complete, uniform saturation of fiber reinforcement layups and to expel excess resin prior to curing of the resin-impregnated fiber reinforcement layups.
REFERENCES:
patent: 4808362 (1989-02-01), Freeman
patent: 4891176 (1990-01-01), Drysdale et al.
patent: 4942013 (1990-07-01), Palmer et al.
patent: 5071338 (1991-12-01), Dublinski et al.
patent: 5087193 (1992-02-01), Herbert, Jr.
Dublinski Alexander C.
Leoni Peter B.
Ramey Philip
Mackey James P.
Radke Terrance J.
United Technologies Corporation
Woo Jay H.
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